Abstract. Hilmi E, Sari LK, Cahyo TN, Muslih, Mahdiana A, Samudra SR. 2021. The affinity of mangrove species using Association and Cluster Index in North Coast of Jakarta and Segara Anakan of Cilacap, Indonesia. Biodiversitas 22: 2907-2920. The affinity of mangrove species using association and cluster index describe relationship among mangrove species. The species association and clustering explain the degree of utilization of resources and space by mangrove species. The association and cluster also describe specific species adaptation in mangrove ecosystems. This paper was aimed to analyze species affinity using association and clustering index of mangrove species. The association index used Chi-square equation and the clustered index used Euclidian distance analysis. The results showed that (i) mangrove density in Segara Anakan (166-4000 trees ha-1) > North Jakarta (220-1100 trees ha-1). (ii) Nypa fruticans, Avicennia marina, Rhizophora stylosa and Rhizophora apiculata dominated in Segara Anakan of Cilacap, and Rhizophora stylosa and Avicennia marina dominated in North Jakarta (iii) The association index had 12 pairs of negative species association and 17 pairs of positive species association, but most of mangrove vegetations had no association. (iv) mangrove ecosystem in Segara Anakan and North Jakarta had four clusters with Euclidean distance (ED score) 484 to describe cluster between Bruguiera parviflora-Bruguiera sexangula until 76430847 to describe cluster among Bruguiera gymnorrhiza, Bruguiera parviflora, Ceriops decandra, Exoecaria agallocha, Nypa fruticans, Ceriops tagal, Rhizophora stylosa, and Sonneratia caseolaris

Abstract:It is the fact that technology has developed rapidly today. Such a development has influenced communication pattern among people, including communication in the field of education, particularly the process of instruction in a class between teacher and student. Audio visual aids began to be utilized to deliver educational messages. In this case, these audio visual aids were functioned not merely as device aids in education but more than that they can function as an effecitve educational message deliverer. To support the success of teaching and learning process in a class, the utilization of audio visual aids need to be maximized. The utilization of instructional media, especially the ones based on Information and Communication Technology (ICT) is a must and need to be adopted by all teachers today if they wish to have effective and efficient instructions. This is valid for not only teachers who work in formal educational institution like a school, but also for teachers working in non-formal educational institution such as educational park of the Quran (TPQ).Abstrak: Dewasa ini teknologi telah mengalami perkembangan yang begitu cepat. Perkembangan tersebut ikut mempengaruhi pola komunikasi antar manusia, termasuk komunikasi dalam dunia pendidikan khususnya proses pembelajaran di kelas yang melibatkan guru dan murid. Alat-alat audio visual tersebut dipergunakan tidak saja sebagai alat bantu pendidikan namun lebih dari itu ia berfungsi sebagai penyampai pesan-pesan pendidikan yang efektif. Untuk menunjang keberhasilan kegiatan belajar mengajar di kelas penggunaan alat-alat audio visual tersebut harus dimaksimalkan pemanfaatannya. Pemanfaatan media pembelajaran khususnya yang berbasis pada Information and Communication Technology (ICT) sekarang ini sudah menjadi keharusan yang harus dijalani oleh setiap guru apabila menginginkan pembelajaran yang efektif dan efisien.Hal ini berlaku tidak saja bagi guru yang bekerja di

This research aims to investigate the impact of the marketing mix, service quality, and university image on student's loyalty. The main purpose of the study is divided into three sub-goal of investigating the effect of the marketing mix on student's loyalty, investigates the effect of service quality on student's loyalty and investigates the influence of university image on student loyalty. Questionnaires were distributed to the students as much as 200 questionnaires using Likert scale, yet only 167 questionnaires are returned. To process the data is used SPSS version 21. The results showedmarketing mix variable, service quality, and university image and a significant positive effect on student loyalty.

Abstract. Hilmi E, Sari LK, Siregar AS, Sulistyo I, Mahdiana A, Junaedi T, Muslih, Pertiwi RPC, Samudra SR, Prayogo NA. 2021. Tannins in mangrove plants in Segara Anakan Lagoon, Central Java, Indonesia. Biodiversitas 22: 3508-3516. Mangrove tannin is polyphenol compound and extractive matter in mangrove vegetation. Mangrove tannins have the potentials to support paint industry, animal feed, tanners and wood adhesives industry. This research is aimed to investigate the mangrove species in Segara Anakan, Central Java, Indonesia that produce tannins, and to analyze the distribution and contents of tannin in the part of mangrove plant. A total of 342 samples from 19 mangrove species was collected from 37 sampling points in Segara Anakan. UV-Visible Spectrophotometry was used to analyze the tannin content in the samples. The results showed that the tannins contained in bark and stems were higher (66.6%) than those in leaves (33.4%). Mangrove vegetation can be classified into five classes in terms of tannin percentage with Heritiera littoralis, Nypa fruticans, and Rhizophora mucronata had highest tannin percentage. The clustering analysis of mangrove tannin showed that Ceriops decandra-Ceriops tagal, Acacia auriculiformis-Sonneratia alba, Sonneratia caseolaris-Xylocarpus granatum, and Avicennia marina-Rhizophora apiculata had high similarity of tannin percentage. The distribution of tannins in mangrove species is as follow: 0.59-10.14 kg trees-1 (bark and stem of mangrove diameter > 10 cm) and 0.20-3.74  kg trees-1 (leaves of mangrove diameter > 10 cm) until 8.84-158.96 kg trees-1 (bark and stem of mangrove diameter > 40 cm) and 4.60-91.65 kg trees-1 (leaves of mangrove diameter > 40 cm). R. mucronata and R. apiculata had the highest total tannin content, ranged between 386.60-460.38 kg trees-1.

Eel, Anguilla bicolor McClelland was hard to mature in captivity, due to low levels of pituitary gonadotropin. In order to stimulate gonadal maturation in captivity, exogenous gonadotropin is needed. The purpose of this study was to assess the effect of GnRH-analog induction on gonadal maturation of tropical eel base on the value of the eye index, gonado-somatic index, and estradiol levels. The study was carried out experimentally with a completely randomized design with three treatments and eight replications. The treatments were the induction of hormone GnRH-analogues with doses of 0.0; 0.5 and 1.0 ml kg-1 body weight. Eel with an average total length of 67 cm and an average weight of 500 g were injected with different doses of GnRH-analog (0.0; 0.5 and 1.0 ml kg-1 body weight), kept in the fiberglass aquarium for two months. The eels were fed with discard fish daily in ad libitum at 16.00 pm. The observed variables were eye index, Gonadosomatic Index (GSI), and estradiol levels. The results showed that injection of three different doses of GnRH-analog did not affect on the increasing of GSI, eye index (P> 0.05), and estradiol (P <0.05). Induction of GnRH-analog of 0.0; 0.5 and 1.0 ml kg-1 body weight can not stimulate the gonadal maturity of tropical eel. AbstrakIkan sidat Anguilla bicolor McClelland sulit matang gonad dalam kondisi budi daya, karena rendahnya kadar gonado-tropin pituitari. Oleh karena itu untuk memacu pematangan gonad ikan sidat dalam kondisi budi daya perlu ditambah-kan gonadotropin secara eksogen. Tujuan penelitian ini adalah mengkaji pengaruh induksi GnRH-analog terhadap pe-matangan gonad ikan sidat berdasarkan perubahan nilai indeks mata, indeks kematangan gonad (IKG), dan kadar estradiol. Penelitian dilakukan secara eksperimental menggunakan rancangan acak lengkap dengan tiga perlakuan dan delapan ulangan. Perlakuan percobaan terdiri atas induksi hormon GnRH-analog dengan dosis 0,0; 0,5 dan 1,0 ml kg-1 bobot badan. Ikan sidat dengan rata-rata ukuran panjang 67 cm dan rata-rata bobot 500 g sebanyak 18 ekor yang telah diinduksi dengan berbagai dosis GnRH analog (0, 0,5 dan 1 ml kg-1 bobot badan) dipelihara dalam akuarium fiberglass selama dua bulan. Pakan berupa ikan rucah diberikan satu kali sehari pada pukul 16.00 secara ad libitum. Variabel yang diamati adalah indeks mata, IKG, dan kadar estradiol. Hasil penelitian menunjukkan bahwa induksi hormon GnRH-analog tidak berpengaruh terhadap peningkatan nilai indeks mata, nilai IKG (p>0,05), dan kadar estradiol ikan sidat (p<0,05). Induksi hormon GnRH-analog dengan dosis 0,5 dan 1 ml kg-1 bobot badan tidak efektif memacu pematangan gonad ikan sidat.

Penelitian ini bertujuan untuk mengetahui (1) bagaimana pembiayaan mudharabah di PT. BPR Syariah Amanah Insan Cita, (2) untuk mengetahui mengapa pembiayaan mudharabah menurun pada tahun 2015, (3) untuk mengetahui kemampuan pembiayaan mudharabah dalam menghasilkan laba pada PT. BPR Syariah Amanah Insan Cita William Iskandar Medan. Metode yang digunakan dalam penelitian ini adalah deskriptif analisis dengan pendekatan studi kasus. Teknik pengumpulan data dilakukan melalui data primer yaitu data yang diperoleh langsung dari sumber data dimana penelitian ini dilaksanakan di PT. BPR Syariah Amanah Insan Cita William Iskandar Medan dan data sekunder yaitu data yang diperoleh dari literatur dan buku-buku yang ada hubungannya dengan masalah yang akan diteliti. Alat analisis yang digunakan adalah analisis trend. Hasil penelitian menunjukkan bahwa kemampuan pembiayaan mudharabah dalam menghasilkan laba dapat dikatakan mampu untuk meningkatkan laba bagi perusahaan walaupun pembiayaan menurun tapi laba yang dihasilkan tetap meningkat. pembiayaan mudharabah memiliki kemampuan yg signifikan dalam meningkatkan laba bersih bagi perusahaan.

This research focuses on the implementation of teaching religion and science in “Trensains” Senior High School at Tebuireng Islamic Boarding School 2. This research concludes that the implementation of the integration of religion and science is summarized in a notion of “trensains” that makes the Qur’an the basis of construction of science by Agus Purwanto and Salahuddin Wahid. The implemenation of such an integration can be catagorized into three dimensions, namely ontological, epistemological, and axiological. In addition, the ‘Trensains’ result in the integration of institutions, the integration of the curriculum, and the integration of learning process in the classroom, outside, and integration in daily activities. The problem experienced in learning includes the prevalence of dichotomy among eductors, and the various abilities of learners. The facilities of learning are not yet complete, and funds are limited. The solution is to strengthen the understanding of the concept of integration of science in all elements in the form of manual integration for educator and learners, and to optimize the performance of educators and guidance and counseling, effective educators in planning learning by doing training preparation of learning plan, to optimize the use of existing facilities, and to maximize the role of the education board and the school committe in order to establish cooperat-ion with stakeholder, agencies, government, or other communities in an effort to improve the quality of the school.

Penelitian ini bertujuan untuk mengetahui dan menganalisis model empiris online trust dan repeat purchase pelanggan Terhadap Situs E-Commerce (Studi Kasus pada Pelanggan E-Commerce di Kota Medan). Penelitian ini menggunakan pendekatan penelitian eksplanatori.  Skala pengukuran variabel menggunakan Skala Ordinal dengan teknik pengukuran variable menggunakan skala Likert. Populasi dalam penelitian ini adalah masyarakat kota Medan. Metode pengambilan sampel dilakukan dengan metode Purposive sampling (judgmental) dan snowball sampling. Kriteria pemilihan sampel dalam penelitian ini adalah masyarakat kota Medan yang pernah berkunjung dan melakukan transaksi di e-commerce yang ada di Indonesia lebih dari 3 kali. Teknik pengumpulan data yang digunakan yaitu wawancara, kuesioner (angket) dan studi pustaka. Metode analisis data yang digunakan adalah Model Persamaan Struktural (Structural Equation Model). Hasil penelitian menunjukkan bahwa Web Quality, Perceived Risk, dan Online Trust berpengaruh signifikan terhadap Repeat Purchase, begitu juga Web Quality dan Perceived Risk berpengaruh signifikan terhadap online trust. Web Quality berpengaruh terhadap Repeat Puchase melalui variabel Online Trust, dan Perceived Risk berpengaruh terhadap Repeat Purchase melalui variabel Online Trust.